Condensed Consolidated Statement Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2013	$ 2,207,371	$ 64,057	$ 183,390	$ 1,961,405	$ (1,481)
Beginning Balance (in shares) at Sep. 30, 2013		64,057
Increase (Decrease) in Stockholders' Equity
Net income	156,697			156,697
Other comprehensive loss	(403)				(403)
Restricted stock awards (in shares)		139
Restricted stock awards	0	139	(139)
Exercise of employee stock options (in shares)		57
Exercise of employee stock options	1,651	57	1,594
Stock option and restricted stock award compensation expense	7,725		7,725
Ending Balance at Mar. 31, 2014	$ 2,373,041	$ 64,253	$ 192,570	$ 2,118,102	$ (1,884)
Ending Balance (in shares) at Mar. 31, 2014		64,253